[Solved] Redirecting Error: The resource cannot be found in ASP.Net

alhakimyyes says:

string url = "~/main.aspx";

Change above code with below.

string url = "main.aspx";

Check the below sample.

HTML

<asp:Button Text="Redirect" OnClick="btnRedirect_Click" runat="server" />

Code

C#

protected void btnRedirect_Click(object sender, EventArgs e)
{
    string message = "You will now be redirected to Main Page.";
    string url = "main.aspx";
    string script = "window.onload = function(){ alert('";
    script += message;
    script += "');";
    script += "window.location = '";
    script += url;
    script += "'; }";
    ClientScript.RegisterStartupScript(this.GetType(), "Redirect", script, true);
}

VB.Net

Protected Sub btnRedirect_Click(ByVal sender As Object, ByVal e As EventArgs)
    Dim message As String = "You will now be redirected to Main Page."
    Dim url As String = "main.aspx"
    Dim script As String = "window.onload = function(){ alert('"
    script += message
    script += "');"
    script += "window.location = '"
    script += url
    script += "'; }"
    ClientScript.RegisterStartupScript(Me.GetType(), "Redirect", script, True)
End Sub